Alternating Current 1 - Current

In ac,the current magnitude and direction is constantly changing.
The current(magnitude and direction) can be represented by means of a graph.
The top quadrant represents current in one direction and the bottom quadrant represents current in the other direction.

The Imax represents the highest value the current would reach (the blue line).
Since the current magnitude is always changing, it is necessary to identify an average current, or a dc equivalent.
This avearge value is called the average current or Irms (the green line). This is called root mean square, which is really a complicated way of saying "average".

How do the numbers work?
Easy!

Assume that Imax = 20A.
(This would be the peak on the graph)
Calculate the average, Irms.

Equation

20 = 1,41(Irms)
Irms = 14,18A

You must learn the above equation.

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